I have white smoke coming out my exhaust. Now i know this is coolant or running lean. now i am not 100% sure it white and not blue white. The thing is I just rebuilt my engine new head gasket and ctr pistons and rings. it is not tuned yet runnoing on stock p72 ecu, stock cams, and rc440 injectors. will a leakdown test tell me if the rings are cracked or head gasket is bad or something. I would rather have someone just tell me your running lean and i will be happy. so what do you guys think. Luis

 

TTT

 

Check your spark plugs first; that can tell if you if you're lean or not. Then, check your coolant. Is it low? Do the simple stuff first. bump for the leakdown question, I don't know though. You shouldn't need to do one if you just rebuilt. Unless you smacked a valve with one of the PCT's... if you did then you'd be screwed a hundred ways more than running lean or blowing out coolant.